linux-fsdevel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH v2 bpf-next 0/3] Add O_PATH-based BPF_OBJ_PIN and BPF_OBJ_GET support
@ 2023-05-18 21:54 Andrii Nakryiko
  2023-05-18 21:54 ` [PATCH v2 bpf-next 1/3] bpf: support O_PATH FDs in BPF_OBJ_PIN and BPF_OBJ_GET commands Andrii Nakryiko
                   ` (2 more replies)
  0 siblings, 3 replies; 12+ messages in thread
From: Andrii Nakryiko @ 2023-05-18 21:54 UTC (permalink / raw)
  To: bpf, ast, daniel, martin.lau
  Cc: cyphar, brauner, lennart, linux-fsdevel, Andrii Nakryiko

Add ability to specify pinning location within BPF FS using O_PATH-based FDs,
similar to openat() family of APIs. Patch #1 adds necessary kernel-side
changes. Patch #2 exposes this through libbpf APIs. Patch #3 uses new mount
APIs (fsopen, fsconfig, fsmount) to demonstrated how now it's possible to work
with detach-mounted BPF FS using new BPF_OBJ_PIN and BPF_OBJ_GET
functionality.

This feature is inspired as a result of recent conversations during
LSF/MM/BPF 2023 conference about shortcomings of being able to perform BPF
objects pinning only using lookup-based paths.

v1->v2:
  - add BPF_F_PATH_FD flag that should go along with path FD (Christian).

Andrii Nakryiko (3):
  bpf: support O_PATH FDs in BPF_OBJ_PIN and BPF_OBJ_GET commands
  libbpf: add opts-based bpf_obj_pin() API and add support for path_fd
  selftests/bpf: add path_fd-based BPF_OBJ_PIN and BPF_OBJ_GET tests

 include/linux/bpf.h                           |   4 +-
 include/uapi/linux/bpf.h                      |  10 ++
 kernel/bpf/inode.c                            |  16 +--
 kernel/bpf/syscall.c                          |  25 +++-
 tools/include/uapi/linux/bpf.h                |  10 ++
 tools/lib/bpf/bpf.c                           |  17 ++-
 tools/lib/bpf/bpf.h                           |  18 ++-
 tools/lib/bpf/libbpf.map                      |   1 +
 .../bpf/prog_tests/bpf_obj_pinning.c          | 112 ++++++++++++++++++
 9 files changed, 193 insertions(+), 20 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_obj_pinning.c

-- 
2.34.1


^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2023-05-20 13:39 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-05-18 21:54 [PATCH v2 bpf-next 0/3] Add O_PATH-based BPF_OBJ_PIN and BPF_OBJ_GET support Andrii Nakryiko
2023-05-18 21:54 ` [PATCH v2 bpf-next 1/3] bpf: support O_PATH FDs in BPF_OBJ_PIN and BPF_OBJ_GET commands Andrii Nakryiko
2023-05-18 23:58   ` kernel test robot
2023-05-19  0:19     ` Andrii Nakryiko
2023-05-19  0:53       ` Alexei Starovoitov
2023-05-19  2:42         ` Andrii Nakryiko
2023-05-19  9:49   ` Christian Brauner
2023-05-19 12:37     ` Christian Brauner
2023-05-19 16:01     ` Andrii Nakryiko
2023-05-20 13:39       ` Christian Brauner
2023-05-18 21:54 ` [PATCH v2 bpf-next 2/3] libbpf: add opts-based bpf_obj_pin() API and add support for path_fd Andrii Nakryiko
2023-05-18 21:54 ` [PATCH v2 bpf-next 3/3] selftests/bpf: add path_fd-based BPF_OBJ_PIN and BPF_OBJ_GET tests Andrii Nakryiko

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).